nasturan

nasturan

[¦nas·tə¦ran]
(mineralogy)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The first ones were mainly metamorphized shales with nasturan (pitchblende) prevailing upon the other U-containing minerals.
Nonoxidized (primary) ones consisted mainly of nasturan (80-90%) with black, gummite and uranium mica.